just to point out...a kit off a vx is not going to bolt up to a vr, there are a fair few differences to the design of the two cars...in particular the front end (bonnet, lights and quarter panels are completely different) which means you need a kit that's made in the vx style to suit the vr.
having said that though ive not seen any places that make them. plenty of places make the clubby and ss style kits...but not the senator, so some custom work might be needed to get the front bar on.